.page-about {
  --about-pad: clamp(3rem, 8vw, 6.5rem);
  --about-side-w: 180px;
  --about-body-w: 860px;
  background: var(--deep-space);
  color: var(--text-primary);
}

/* ===== 首屏：斜切动势 + 扫描线 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  min-height: 560px;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 30px) 0 96px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), 0 100%);
}

.page-about .about-hero-bg,
.page-about .about-hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
  filter: contrast(1.08) saturate(1.15);
}

.page-about .about-hero-scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(115deg, rgba(10, 17, 40, 0.97) 0%, rgba(17, 27, 61, 0.82) 50%, rgba(10, 17, 40, 0.42) 100%),
    repeating-linear-gradient(0deg, rgba(57, 255, 20, 0.04) 0px, transparent 1px, transparent 3px, rgba(33, 82, 163, 0.06) 4px);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
}

.page-about .about-hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--electric-orange);
  margin: 28px 0 12px;
}

.page-about .about-hero-pin {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--electric-orange);
  box-shadow: var(--shadow-orange);
  border-radius: 50%;
  animation: about-pulse 2.6s var(--ease) infinite;
}

.page-about .about-hero-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.1rem, 7vw, 4.1rem);
  line-height: var(--line-tight);
  margin: 0 0 18px;
  max-width: 900px;
  letter-spacing: 0.01em;
}

.page-about .about-hero-lead {
  font-size: 1.05rem;
  line-height: var(--line-relaxed);
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 30px;
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.page-about .about-hero-stat {
  flex: 1 0 140px;
  max-width: 200px;
  background: rgba(17, 27, 61, 0.72);
  border-top: 2px solid var(--neon-green);
  padding: 14px 16px;
  backdrop-filter: blur(4px);
}

.page-about .about-hero-stat dt {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.08em;
}

.page-about .about-hero-stat dd {
  font-family: var(--font-numeric);
  font-size: 1.5rem;
  color: var(--text-primary);
  margin: 0;
}

.page-about .about-hero-orbit {
  position: absolute;
  right: -140px;
  top: 80px;
  width: 420px;
  height: 420px;
  z-index: 1;
  pointer-events: none;
}

.page-about .about-hero-ring {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(57, 255, 20, 0.18);
  border-radius: 50%;
  animation: about-orbit 8s var(--ease) infinite;
}

.page-about .about-hero-ring--slow {
  inset: 40px;
  border-style: dashed;
  border-color: rgba(255, 107, 0, 0.16);
  animation-duration: 16s;
}

.page-about .breadcrumb-link {
  color: var(--text-muted);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover {
  color: var(--neon-green);
}

/* ===== 页内锚点 ===== */
.page-about .about-anchors {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(139, 147, 167, 0.18);
}

.page-about .about-anchors-label {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--electric-orange);
  margin-right: 8px;
}

.page-about .about-anchor-link {
  font-family: var(--font-numeric);
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-anchor-link:hover,
.page-about .about-anchor-link:focus-visible {
  color: var(--neon-green);
  border-color: rgba(57, 255, 20, 0.35);
  background: rgba(57, 255, 20, 0.06);
}

/* ===== 通用章节 ===== */
.page-about .about-section {
  position: relative;
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .about-section > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-section-grid {
  display: grid;
  gap: 18px;
}

.page-about .about-section-side {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-section-num {
  font-family: var(--font-numeric);
  font-size: 2.4rem;
  line-height: 1;
  color: rgba(57, 255, 20, 0.18);
  -webkit-text-stroke: 1px rgba(57, 255, 20, 0.45);
}

.page-about .about-section-rule {
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.4), rgba(33, 82, 163, 0.1));
}

.page-about .about-section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  margin: 0 0 8px;
  line-height: var(--line-tight);
}

.page-about .about-section-kicker {
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--neon-green);
  margin: 0 0 18px;
}

.page-about .about-prose p {
  color: var(--text-muted);
  line-height: var(--line-relaxed);
  margin: 0 0 16px;
  max-width: 72ch;
}

/* ===== 品牌起点事实列表 ===== */
.page-about .about-fact-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-fact-item {
  background: var(--panel);
  border-left: 3px solid var(--neon-green);
  padding: 16px 18px;
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-numeric);
  font-size: 1.8rem;
  line-height: 1.1;
  color: var(--text-primary);
}

.page-about .about-fact-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ===== 关键里程碑 ===== */
.page-about .about-section-milestones {
  background: linear-gradient(120deg, rgba(27, 35, 58, 0.5) 0%, rgba(10, 17, 40, 0) 70%);
}

.page-about .about-section-milestones::before,
.page-about .about-section-support::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(-45deg, rgba(57, 255, 20, 0.02) 0px, transparent 2px, transparent 8px, rgba(33, 82, 163, 0.04) 9px);
}

.page-about .about-timeline {
  position: relative;
  margin-top: 30px;
  padding-left: 34px;
}

.page-about .about-timeline-veil {
  position: absolute;
  left: -20px;
  top: -40px;
  width: 260px;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-timeline-list {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--deep-blue-hud) 0%, rgba(57, 255, 20, 0.35) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding-bottom: 22px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: var(--shadow-green);
}

.page-about .about-timeline-details[open] .about-timeline-toggle {
  transform: rotate(45deg);
}

.page-about .about-timeline-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-timeline-head::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline-year {
  font-family: var(--font-numeric);
  font-size: 1.4rem;
  color: var(--soft-blue-glow);
  min-width: 58px;
  letter-spacing: 0.03em;
}

.page-about .about-timeline-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
}

.page-about .about-timeline-toggle {
  margin-left: auto;
  font-family: var(--font-numeric);
  font-size: 1.1rem;
  color: var(--electric-orange);
  transition: transform 0.25s var(--ease);
}

.page-about .about-timeline-desc {
  margin-top: 10px;
  padding: 12px 14px;
  background: rgba(17, 27, 61, 0.5);
  border-left: 2px solid var(--neon-green);
}

.page-about .about-timeline-desc p {
  margin: 0;
  font-size: 14px;
  line-height: var(--line-normal);
  color: var(--text-muted);
}

/* ===== 团队与组织 ===== */
.page-about .about-team-grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-team-card {
  background: linear-gradient(135deg, var(--panel) 0%, rgba(17, 27, 61, 0.35) 100%);
  border-left: 3px solid var(--neon-green);
  padding: 20px;
}

.page-about .about-team-card h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.page-about .about-team-count {
  font-family: var(--font-numeric);
  font-size: 2rem;
  color: var(--electric-orange);
  margin: 0 0 8px;
  line-height: 1;
}

.page-about .about-team-card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: var(--line-normal);
  color: var(--text-muted);
}

.page-about .about-team-figure {
  margin: 28px 0 0;
}

.page-about .about-team-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 10px;
}

.page-about .about-team-figure figcaption,
.page-about .about-cert-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== 分类标签：坐标索引地图 ===== */
.page-about .about-section-taxonomy {
  background: linear-gradient(135deg, var(--background-alt) 0%, var(--deep-space) 60%);
}

.page-about .about-taxo-map {
  margin-top: 26px;
  background-image:
    linear-gradient(rgba(33, 82, 163, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(33, 82, 163, 0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  border: 1px solid rgba(33, 82, 163, 0.3);
  padding: 14px;
}

.page-about .about-taxo-grid {
  display: grid;
  gap: 12px;
}

.page-about .about-taxo-item,
.page-about .about-taxo-bet {
  position: relative;
  display: block;
  background: rgba(17, 27, 61, 0.85);
  padding: 18px 48px 16px 18px;
  text-decoration: none;
  color: var(--text-primary);
  border: 1px solid rgba(33, 82, 163, 0.35);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-taxo-item:hover,
.page-about .about-taxo-item:focus-visible {
  border-color: var(--neon-green);
  background: rgba(17, 27, 61, 0.95);
  transform: translateY(-2px);
}

.page-about .about-taxo-item h3,
.page-about .about-taxo-bet h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.page-about .about-taxo-item p,
.page-about .about-taxo-bet p {
  margin: 0;
  font-size: 13px;
  line-height: var(--line-normal);
  color: var(--text-muted);
}

.page-about .about-taxo-coord {
  position: absolute;
  right: 12px;
  top: 12px;
  font-family: var(--font-numeric);
  font-size: 13px;
  color: var(--electric-orange);
  letter-spacing: 0.05em;
}

.page-about .about-taxo-bet {
  margin-top: 12px;
  border-left: 3px solid var(--electric-orange);
}

.page-about .about-taxo-bet .about-taxo-coord {
  color: var(--neon-green);
}

.page-about .about-taxo-note {
  margin-top: 14px;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px dashed rgba(139, 147, 167, 0.2);
  padding-top: 12px;
}

/* ===== 资质与认证 ===== */
.page-about .about-cert-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cert-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--panel);
  border: 1px solid rgba(33, 82, 163, 0.3);
  padding: 16px 18px;
}

.page-about .about-cert-item::before {
  content: "#";
  font-family: var(--font-numeric);
  font-size: 1.2rem;
  color: var(--neon-green);
  line-height: 1.4;
}

.page-about .about-cert-item h3 {
  margin: 0 0 4px;
  font-size: 1rem;
  line-height: var(--line-tight);
}

.page-about .about-cert-item p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: var(--line-normal);
}

.page-about .about-cert-figure {
  margin: 28px 0 0;
}

.page-about .about-cert-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 10px;
}

/* ===== 联系与支持 ===== */
.page-about .about-contact-note {
  color: var(--text-muted);
  line-height: var(--line-normal);
  margin: 0 0 20px;
}

.page-about .about-contact-grid {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-about .about-contact-card {
  background: var(--panel);
  border-top: 2px solid var(--electric-orange);
  padding: 18px;
}

.page-about .about-contact-card dt {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.page-about .about-contact-card dd {
  margin: 0;
  font-size: 1.02rem;
  line-height: var(--line-normal);
}

.page-about .about-support-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-support-link {
  font-size: 14px;
  color: var(--neon-green);
  text-decoration: none;
  border: 1px solid rgba(57, 255, 20, 0.3);
  padding: 8px 14px;
  border-radius: 4px;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-support-link:hover,
.page-about .about-support-link:focus-visible {
  background: rgba(57, 255, 20, 0.08);
  border-color: var(--neon-green);
}

/* ===== 动画 ===== */
@keyframes about-pulse {
  0%, 100% { transform: scale(1); opacity: 0.55; }
  50% { transform: scale(1.25); opacity: 1; }
}

@keyframes about-orbit {
  0%, 100% { transform: scale(0.96); opacity: 0.3; }
  50% { transform: scale(1.04); opacity: 0.75; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero-ring,
  .page-about .about-hero-pin {
    animation: none;
  }
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .about-fact-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-taxo-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    min-height: 640px;
    padding-top: calc(var(--header-h) + 48px);
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), 0 100%);
  }

  .page-about .about-hero-title {
    font-size: 3.4rem;
  }

  .page-about .about-hero-stats {
    gap: 10px;
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-cert-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-section-grid {
    grid-template-columns: var(--about-side-w) minmax(0, var(--about-body-w));
    gap: clamp(2rem, 6vw, 5rem);
  }

  .page-about .about-section-side {
    display: block;
    padding-top: 6px;
  }

  .page-about .about-section-num {
    font-size: clamp(4.5rem, 6vw, 7rem);
    line-height: 0.9;
  }

  .page-about .about-section-rule {
    display: block;
    width: 2px;
    height: 40%;
    margin-top: 14px;
    background: linear-gradient(to bottom, rgba(57, 255, 20, 0.5), rgba(33, 82, 163, 0.1));
  }

  .page-about .about-fact-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-contact-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(260px, 340px);
    column-gap: 60px;
    align-items: end;
  }

  .page-about .breadcrumb,
  .page-about .about-hero-eyebrow,
  .page-about .about-hero-title {
    grid-column: 1 / -1;
  }

  .page-about .about-hero-lead {
    grid-column: 1;
    margin-bottom: 0;
  }

  .page-about .about-hero-stats {
    grid-column: 2;
    grid-row: 4 / span 2;
    flex-direction: column;
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-taxo-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-timeline-veil {
    left: -32px;
  }
}